Garbage Disposal: What to Put In and What to Avoid

The garbage disposal is one of the most misunderstood appliances in the kitchen. Many homeowners treat it as a catch-all for food waste — but that's exactly what causes the clogs, jams, and drain backups that lead to service calls. Here's the honest guide to what your disposal can handle, what it can't, and how to keep it working properly.

How a Garbage Disposal Actually Works

First, a clarification: garbage disposals don't have blades. They have impellers — blunt lugs that spin at high speed and fling food waste against a grind ring that breaks it down. The ground material then flows with water through the drain. Understanding this helps clarify why certain items are problematic: it's not just about whether the disposal can grind something, but whether the ground material can flow through the drain system without accumulating.

What You Can Put Down the Disposal

• Small, soft food scraps that would naturally wash down the drain
• Ice cubes (helps clean the impellers and grind ring)
• Small citrus peels (occasional — helps with odor, not a heavy cleaning method)
• Small amounts of cooked vegetables
• Liquid dish soap during cleaning

What to Never Put Down the Disposal

Grease, Fat, and Oil

This is the most important rule and the one most frequently ignored. Grease liquefies in hot water and passes through the disposal easily — but it solidifies in the drain line as it cools. Over time, grease accumulation in drain lines is the number one cause of kitchen drain blockages. There is no safe amount of grease to put down the drain. Collect it in a container and discard it with solid waste.

Fibrous Vegetables

Celery, asparagus, artichokes, corn husks, and similar fibrous vegetables have stringy fibers that wrap around the disposal's impellers, causing jams and motor strain. These should always go in the compost or trash.

Starchy Foods

Pasta, rice, oatmeal, and potato peels expand in water and form a thick paste that clogs drain lines. These items are particularly problematic because the disposal grinds them but doesn't eliminate the starchiness — it just creates smaller particles that form an even more effective plug.

Coffee Grounds

This surprises many people, since coffee grounds are fine and feel like they'd pass through easily. In practice, they accumulate in drain lines — particularly in the P-trap and horizontal sections of pipe — eventually contributing to clogs. They're better in the compost or trash.

Bones and Hard Shells

Chicken bones, shellfish shells, and similar hard materials can damage impellers or the grind ring, or can become lodged in the mechanism. They also don't break down in the drain system regardless. These belong in the trash.

Fruit Pits and Seeds

Cherry pits, peach pits, avocado pits — these are far too hard for residential disposals. They can damage the unit's components.

Eggshells

There's debate about eggshells, but the general professional advice is to keep them out of the disposal. The membrane inside the shell can wrap around components, and the shells grind into a fine sand-like material that can accumulate in drain lines.

Good Operating Habits

Always run cold water before starting the disposal and keep it running for 20–30 seconds after you turn the disposal off. Cold water keeps any fats solid so they pass through more effectively and don't coat the pipe walls. Hot water does the opposite and should not be used during disposal operation.

Never run the disposal dry. The water lubricates the mechanism and helps flush ground material through the drain.

Disposal Not Working?

If your disposal hums but doesn't spin, it's probably jammed. Look for the reset button on the bottom of the unit and press it. Most disposals also come with a small hex key that fits an access point on the bottom — you can manually rotate the impellers to free a jam. If the disposal makes no sound at all, the reset button or the circuit breaker may be the issue. For leaks, grinding noises, or persistent jams, call us at +1 (972) 544-6460 for professional service.